H - Electricity – 02 – J
Patent
H - Electricity
02
J
H02J 9/00 (2006.01) H02J 9/06 (2006.01)
Patent
CA 2114507
The present invention is directed to a single phase off- line uninterruptible power supply system for direct and continuous supply of an AC signal with in-tolerance voltage and in-tolerance frequency to an electrical load connected to an output node of the system, the system comprising: a transfer switch connected between an AC mains node and the output node, controlled for switching between a mains mode and a backup mode; a backup circuit connected between the output node and a backup battery node, for receiving the AC mains power supply signal and generating a battery charge signal on the battery node, while maintaining a high AC mains power factor, in the mains mode, and receiving a battery DC voltage on the battery node and converting it into the AC signal on the output node in the backup mode; an AC mains monitor unit which continuously senses the AC mains power supply signal for determining an out-of-tolerance condition and generating a mode transfer signal; a mode transfer control unit for receiving the mode transfer signal and configuring and controlling the backup circuit in a battery charging configuration during the mains mode and in an inverter configuration during the backup mode, the battery charging and the inverter configurations sharing a number of electric components; and a control unit for controlling the transfer switch, the backup circuit, the AC mains monitor unit and the mode transfer control unit.
Earanky Vijaya
Sivakumar Seshadri
Gowling Lafleur Henderson Llp
K.b. Electronics (1989) Limited
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